From http://www.cnblogs.com/cww2010/archive/2012/04/30/2476844.html
Default namespace
Xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" Silverlight core namespace
Xmlns: x = "http://schemas.microsoft.com/winfx/2006/xaml" XAML namespace
Xmlns: D = "http://schemas.microsoft.com/expression/blend/2008" design-related namespace
Xmlns: MC = "http://schemas.openxmlformats.org/markup-compatibility/2006" XML interactive namespace that tells the XML syntax which needs to be processed and which can be ignored.
The namespace of the custom Class Library:
1. General Addition Method
Xmlns: My = "CLR-namespace: XXX; Assembly = XXXX"
2. Add a URL. Multiple class libraries can be merged:
Add the following attributes to assemblyinfo. CS of the class library,
Using system. Windows. markup;
[Assembly: xmlnsdefinitionattribute ("http://www.url.com", "namespaceurl", assemblyname = "namespaceurl")]
In the header of the introduced project
Xmlns: My = "http://www.url.com"